from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An insane person.
- n. A person who has an excessive enthusiasm or desire for something: a sports maniac.
- n. A person who acts in a wildly irresponsible way: maniacs on the highway.
- adj. Variant of maniacal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An insane person, especially one who suffers from a mania.
- n. A fanatic, a person with an obsession.
from the GNU version of the Collaborative International Dictionary of English
- adj. Raving with madness; raging with disordered intellect; affected with mania; mad.
- n. A raving lunatic; a madman.
from The Century Dictionary and Cyclopedia
- Raving with madness; mad or crazy; insane.
- n. One who raves with madness; a madman.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an insane person
- adj. wildly disordered
- n. a person who has an obsession with or excessive enthusiasm for something
From Late Latin maniacus, maniacal, from Greek maniakos, from maniā, madness; see men-1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
Late Latin maniacus, from Ancient Greek μανιακός (maniakos), adjectival form of μανία (mania, "madness"). (Wiktionary)